Zoey's backstory is not so interesting. A flashback have been more than enough. And making a full update with music, minigames and all is not a 2-3 weeks job. We would already have the real update since September, probably.
MC wants to drop out college because the second night he finds himself naked in the middle of the street without even a place to sleep. And it's just for less than an hour, until he finds Derek. Everybody would have a bad moment and would like to just go home and feel safe in a situation like that one.
Josy is childish. She wants it all and she wants it now, MC and Maya, and she doesn't want to be a grown up. She even says that during her date with the MC. So, her parents treat her like a child. Another character that I don't understand why people find attractive, except because want to see some renders of hers sitting on Maya's face.
Jill is making a joke, that's all. She's not a brat. Actually, she's a pretty decent character with a lot of positive traits, she really cares about the MC, and her narrative arc is not bad (it's Tybalt narrative arc the bad one). But people here doesn't like her because DPC made a mistake with her mouth and her smile looks weird

If I know something, is that most of people only care about the characters looking good and don't even think about their real personalities. Well, I'm sorry, but I like characters for their personalities and acts more than due how their mouths look.
For sure, there are other bad characters in BADIK.